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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11beaf35b4c7e7406cd5eb04e10d93adce7626579161a2255e91935f0854207' 
  AND token = 'daswwITP4AkWXCM/N7r2bNBE0EcvFEgpy4S2kwZUjjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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