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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edaf24712be5e2aecf1e607393b3bd30cdcf9867c6e89f7ddb7bc2dbef6dfb8e' 
  AND token = '3EBmBteBNl+HrdgcFfSF13+3s8MUiAXra3ZqUBoNtZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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