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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75723d85b5d8e6777d9e479123818a567e5cee2cb8acdbbf1c1b939a9a2b95b1' 
  AND token = 't1/yFhPrfo055Rp0/dI92GVSuee5htvSCqlmEljiQoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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