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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607267521aeb2ceab014df5f5d138d386177bc3a219f87165bf585e68adc7eec' 
  AND token = 'w/x7Ufut83KdRirngl+t2c9+FCXVP1IT6LOxHB6i5nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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