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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88176a1d6b832f2f6c47235b415afb8b51890d9b41d5109196e988ed746e3b2' 
  AND token = '/BYFf6cc0uef2leGzbH1bqbnrmmt2xJrtGsc71gXJik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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