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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f15f774c85b537acb541cb3ff1abd597bc4e20401abc050ac8e6b55199737a1' 
  AND token = 'tdd86Dil3JkQ7LvgxBE5VdberGGJYVFzTczVDLAyl+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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