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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f10b5b5a93c1766a9de54e393798fbec2eb53ff513387afcf55d2a1c9730d22' 
  AND token = 'CgcZV9sKNg9hnnC36PLQ2KzJoLiXIWdmVJFkj2R4POI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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