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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b1655151e6bf9965458a0638181ff51599df00b8dc943fd989274a5fc8483f' 
  AND token = 'vpa02AmNHFPetKEcV63ryBkmavI+BW+qe40QzdRSKQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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