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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c16da3303e248f67b667d60fa8af77d3b59d3ddf7808ef9b3d4b8f693ac0a3' 
  AND token = 'gaRiP63lpLNmaD2uwGGgP9j/2/KkgUlGDFw7IgKAi9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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