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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f80862ebaa0dd47bad83890ac23b7e5a9802e0f34f6f37e87705159e685370' 
  AND token = 'jeNX662e87hBzgSNPHAv2MDZGD897Sa7obx8NTOelX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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