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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fb279b41af8fb506ee0a7da0fd2f2671cfb37e5daa96a141d33aeaebc5883b' 
  AND token = 'JSnFDrPeHYLATA9f0DDZKBlqAvAtBSlBPKsXVpg8byc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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