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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e284b6fc0f3f0f397aafeea7f51e05d575af5f3a917f9ae5f7010503a4cfa90' 
  AND token = 'vKS7CNdvUyU8966UTiTypOvMC93Kn8VwGq1elVO74v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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