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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55eb2756c26dc1f33d0371c824b6805b0dcf31e51660a95206840de9596641a8' 
  AND token = 'CygqALnzJ96Upje9BR5h+AFqVFWglQO7gR55hNklj2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}