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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e7f9d17e2d6e32c30d0591140ad497f16c364192c39f1825fcaf10fc69e58f' 
  AND token = '4HgFH61RquYXTR3BFDdGFp6QAhnpxYl7m7M3aO2Mtec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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