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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8baf98b2d1355f89763d037ee00ca67c0eae95bfa62e10d818089f625695b319' 
  AND token = 'YLd8sNVXDyoA1/N0BSHgBwmQaT2Uw/Hzh8xy5FKmg68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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