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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe10606981abfefd7070e5d3e8039dc9aff8aba2aed1453e276a91f4ba59dea' 
  AND token = 'k/2upjaOJwqJhGqHgZ0osviGA5dpYdF6B8sxsS4J9Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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