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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3f7f101b0edf448d0ed3ed79a0a626ad8ee433a67a74d3d31b38235a6c3fe1' 
  AND token = 'xTASwlVBxc3PuknKOZkpxGRaywA+GkLLDW8bSeg5QKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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