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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13bfeac265ae65eaf63749c1530f34ab251f17b1358892a77bcf7aab3965fc5' 
  AND token = '4J1z63NhpDy8jHfWQEZao8ryCwAFwo0Rya/skbFFKTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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