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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d8609d59f78d9dbb394a10e6b7525914b0c0781c0387308699f84429746a7e' 
  AND token = 'G3cOhaSuymsUsOA5gyfXVBWcEf6dCpL5qEt1xsiDDns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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