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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7966bcfc7ece9072a069cbe7a63290ae88214de741cb7b88f9574fc2034e45a' 
  AND token = '00kWAhxXMZN6X7eWLLk7RnFEqOmJ4iT6Wafrig2BFe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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