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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85192adcd0e746d287d3d6e1f3b03710f3d807d2f3f90bb9c4b9204f3bb5b6d6' 
  AND token = 'LegaEI3ViZdUa5up+xJFwCTlExccYxfpkO7tn0+ryfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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