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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc832267302154987642c4e76ca456913de72383d20ef54198416fa6772a75f6' 
  AND token = '70mwFasnsZ1hSDlzhkoXsv6J/RN5WvOmDgYelAa+r2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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