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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ee95ecbaec4b61ba5f09e8455427212faf5860efbbbc4f0a70647db88b8c75' 
  AND token = 'F+WmmmKAheFJnb/3iKLRB6X2dmOgZHPFy3GpyQGXmR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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