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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0126c1f6d33865b90e05813f2410dc641c5241feb9728f92edabfc497e2402' 
  AND token = 'nbvZ9MOtDHi68eolDyukpFYLG4sm4auPQEAquD16bB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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