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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccbf19f2429f7b38064d151c9d67e95fe3a4fedc3053a5b293bd3fb9b0002f15' 
  AND token = 'LYTaFI2sRnGaev5J0OsB9wDIWQS2AyHFX0q84OY6Lkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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