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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afa8c14336a69ccf832b126d99429be90062484d7c31d4dbe42e16d7702ae68' 
  AND token = 'YsY9Cif6NAI5du7K8Tx7XFTGpcdL7d8yy1iz2P1/Tyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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