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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8308185a691d634511c1fdf98c6c29790d783dc0a06111c8b7afb0ef403a4f77' 
  AND token = 'DArIZYDElBzdd6VMi7CGufHpULUZwp4rCK7wk9/l/Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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