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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8efffb3c53e420643905a114d1d4102d6949d5a13347f715898d37f7ef7442' 
  AND token = 'rw74gTswMJTJATBF+JDjhwI68N30NgRoftlJ/7FZTHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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