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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2875f79cbcebcce9c1b289fa488688107bd245a4faa413da83023a8f3df74ef0' 
  AND token = 'ajsNjp7ip99B+Bs7NjZ5Kmv0sfBLDVUkrYCHi1+EDs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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