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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650711a765fb0206de7c1606671992e8b8c0a97025de2a58af9e72f14f52d0e7' 
  AND token = 'Tz2qxWI2pfJvQDA4McfaNLg41I/Wzg8mExiMytF8smY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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