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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5bfaf5d3fd9d319d3df33331f6b89b4259a839ec62e1c14cbb9410f599ed9e0' 
  AND token = '8roaEBSwZ5NTdgEJGoGcTm1EdXrp6m7Gq/vqAZtBk44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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