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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea14d6c55af73523f222813d9a847866592d69b195d7ea372bead9dd8466c49a' 
  AND token = 'QqSzFszKfrREwtMy2bzKB9c08LjKXqL5/S2DvT4q8hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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