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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97b5c22c21ef3a9c01ea80ad12fc960d5b4a2dec61c9d67c44a983a1ee4cc38' 
  AND token = 'MwvQit6o8w/YuwtOILwtUDlesOS3XIdEO/i+bynRRhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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