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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f43988ecc37c128bfdf7649e5f78557cc9126fed12cbe78c31d2a9d60e90d5' 
  AND token = 'w1/rHOHU+zV9CJcgsK+Op1KikccG8EBhtELXIanIFTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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