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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a46f45a49bec5066bb8d8e91deaf2752b3c35e996fb6649e8bc1eeaf6ab936' 
  AND token = '5H4WW+Cu2VRRUDLo+tbo2Pu1unP3S0P3VMfqn1YB0KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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