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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814f7c0b98dc887d8435dce35c73a1ceadbfa0a0edf05dc22cea58d0ac6d4a43' 
  AND token = 'uudKEZlVCjJ0PrvwM4eZ20jYW322mrpSzwYo06FQths=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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