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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f9ee684a72a781382ad7c2224508ba721e21713134a1a075ad7c2258cca403' 
  AND token = '3KSEyB+XWF8b48X7AZ12G/uYr6kVDRtEdD0b5pJq2uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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