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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d2bcbfc5ddfc5c21f4ed524735f07c54b1792d764e4a6ee10c1297490553e6' 
  AND token = 'K2QDLjLuv1+fuhMBR1NU39R+fJrvvV989ipLB+bhcAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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