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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1779384919482ba59a5e08997e1aefb1c391a3ea4cea2abfd5de9922e4967179' 
  AND token = 'EVZOvcwK1MKLAtQ+5W1sEba4jp9xg6TQqZroeurECbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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