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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1318906a06fb77a42b16f04ad5d3ba1c6cf62b1c1907439b2cf69657a2b816a' 
  AND token = 'QbHN5+MPwo3rvPc9wJ4gQ4/w4531cCG78YxnfJjtyZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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