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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2893e6f7604b6288fd1cd483dab8b64e580cdb85d51eed690dfef64396517d' 
  AND token = 'jWuQpnIXEextAM8d6nBP0AFOomxW726ERyjjfSHNmnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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