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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84d42b0b7c12bbf3ab9c25e2b35bafa54ffc6b29fe455e19d7cc01dbf89ddc6' 
  AND token = 'MoB7dNtup59/OZ7y/SChQH1hvKijFyEp7vCJkdLB5Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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