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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ba0bbe8f21c74843cd8d71ccc594c73818d74454523d0951295916a8572031' 
  AND token = 'zHRM+E0CPhUdv5JfT0DeHzsEnMJh2dLsVKkFoxvDSHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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