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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed7b7481c45c7345cc0d137d2e53977138606dc2e3bb7d5309916145a3bb2ad' 
  AND token = '8euoJtlNbSF6dHYdqU2KrhzBqIhWcG1b1AX2d+2lfDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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