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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7caa414c3315d517cf73de533ed868339b02eb717383b924433c21b646a3315d' 
  AND token = 'u6q+hX2MVcF7/CmG656UNdWP2G/hRiKmqxOEsSPieKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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