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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d7413d216733b79a5a0b0cd0082f8138ef6fd4c77401a059e4460f88c35b32' 
  AND token = '7kYn775S1x3nXTui8MH073d8cjyRpE/jcXObughrYM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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