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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecfcb577f0b3559c99ae1d72d176e9ff294b9f8baf8f19bf735b7ae63ffbfccc' 
  AND token = 'FZK9ednNY2IxGVz525d8d0vQOwcTp8DqoTfvtvVq2F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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