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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b8d475258be5de815858d72a90c9d91790f8f0e1be149d585c71abe41d933b' 
  AND token = 'fTqh1ho/CZfnGTyNr/oKM3dxhgdtsAW0Rp+MoLomQbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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