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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c52089e866fb6fb4faef7c3ad09441e7f4cc532ac41d356527256d5c4984aa' 
  AND token = '/VkAOWUj0ZzkLRJbaHJuELfeJSDIoSspB0a+CoLP2DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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