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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6dbead2470717ae0ae10daed92601e69f0577dfd4867b976fdc78c790a8647' 
  AND token = 'n5q05KFp/8JgQVqIbPavTcWf2J3NTfuaM2RdCl4MDLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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