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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d0c13cdc4f2b2bdae2bcb11337c6e965aefa49bb41c19f078719dfdf757d80' 
  AND token = 'rOegj6rFdZYjZ9kP7THf2LNf+nLchb16Mpsp0AVprkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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