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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7239c76c63a37b3bc07f58d2f08fd123ddfd2e0840ee254b11162bd757035781' 
  AND token = 'BTf3BFlBUGnZ4kUUVvIl8p12QeQm15rPEi6026y3oIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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