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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad97aa652240bd17c4aa4230d6c76033d04abc85c3d7da6182c84149db2212c' 
  AND token = 'DjnEeyV+HU4qRDLPf2pdK5Miib6lKZ8pnvA+a/bXa3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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