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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9391cc632cc0ad349a62429650043278c13afce98d3b844f6ba3c5bf7b96b94' 
  AND token = 'UejITmWyjYr+dC4rzdQe8STZ1ZKAg8+ftbUw5kZTJz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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